On the other side, I have raised the problem of some needed
missing super-types such as xs:numeric.
I would also like to see union types accepted, e.g. a union of date, time,
and dateTime.
With elements, you may be able to handle it by defining substitution groups.
XML Schema 1.1 allows an element to be a member of several substitution
groups, giving you a complete lattice if you want it.
Michael Kay
http://www.saxonica.com/
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